Magnetic core structure and differential and common mode integrated inductor

Abstract

The utility model provides a magnetic core structure and a differential and common mode integrated inductor, the magnetic core structure comprises a first cylinder, a second cylinder, a third cylinder, an upper bottom and a lower bottom, the upper bottom and the lower bottom are oppositely and parallelly arranged, the first cylinder is located at one end of the upper bottom, one end of the first cylinder is connected with the upper bottom, the other end of the first cylinder is connected with the lower bottom, and the second cylinder is located at the other end of the upper bottom. One end of the third column is connected with the upper bottom, the other end of the third column is connected with the lower bottom, the third column is located between the first column and the second column, one end of the third column is connected with the upper bottom, and an air gap is formed between the other end of the third column and the lower bottom; the first column body, the second column body, the third column body, the upper bottom and the lower bottom are integrally formed; through optimization of the magnetic core structure, the upper bottom and the lower bottom are arranged to connect the first column body with the second column body, meanwhile, the third column body is arranged on the upper bottom, and the third column body is arranged between the first column body and the second column body, so that the magnetic core is integrated into an integral structure, and compared with dispersed magnetic columns, the integrally formed magnetic core structure simplifies the structure of the magnetic core.

Description

Technical Field

[0001] The utility model relates to the technical field of inductor devices, and in particular to a magnetic core structure and a differential and common mode integrated inductor. Background Art

[0002] Differential-mode inductors and common-mode inductors are EMC components frequently used in electronic circuits. They are usually manufactured, installed, and used separately as two independent components. In order to improve the integration of magnetic components in the power supply and reduce costs, a leakage magnetic shunt is added between the two coils of the common-mode inductor to increase the leakage inductance of the common-mode inductor, thereby forming a differential-mode effect and forming an integrated differential-common-mode inductor.

[0003] For example, the Chinese patent application number CN201220117785.7 discloses an integrated common-mode and differential-mode inductor, which includes a frame, a first magnetic core, a second magnetic core, a winding, an iron clip and a pin, wherein the first magnetic core, the iron clip and the second magnetic core are arranged on the frame in sequence, the winding is wound on the first magnetic core and the second magnetic core respectively, the pin is arranged on the frame and connected to the winding, thereby forming an integrated common-mode and differential-mode inductor.

[0004] In the prior art, the two magnetic cores of the integrated common-mode and differential-mode inductors are designed independently, that is, the first magnetic core and the second magnetic core are produced separately, and then the first magnetic core and the second magnetic core are respectively placed on a frame and wound. The production cost of the split magnetic core is high. Utility Model Content

[0005] In view of the deficiencies in the prior art, the present application provides a magnetic core structure and a differential and common-mode integrated inductor.

[0006] A magnetic core structure disclosed in the present application includes: a first column, a second column, a third column, an upper base and a lower base, the upper base and the lower base are arranged opposite to and parallel to each other, the first column is located at one end of the upper base, one end of which is connected to the upper base, and the other end is connected to the lower base, the second column is located at the other end of the upper base, one end of which is connected to the upper base, and the other end is connected to the lower base, the third column is located between the first column and the second column, one end of which is connected to the upper base, and an air gap is formed between the other end and the lower base; the first column, the second column, the third column, the upper base and the lower base are formed as one piece.

[0007] Preferably, along the length direction of the third column, the first column and the second column are symmetrical.

[0008] Preferably, the first column, the second column, the third column, the upper base and the lower base are all made of manganese zinc, nickel zinc, hard magnetic or sendust material.

[0009] Preferably, outer surfaces of the first column, the second column, the third column, the upper base and the lower base are all sprayed with insulating paint.

[0010] Preferably, the first column, the second column, the third column, the upper base and the lower base are integrally die-cast.

[0011] Preferably, the cross sections of the first column, the second column and the third column are circular or rectangular.

[0012] According to another aspect of the utility model, the present application also provides a differential common mode integrated inductor, which includes a magnetic core structure, and also includes a first coil and a second coil, the first coil is wound on the first column, the second coil is wound on the second column, and the number of turns of the first coil and the second coil is equal.

[0013] Preferably, the first coil and the second coil are both flat enameled wires.

[0014] The beneficial effect of the present application is that: by optimizing the magnetic core structure, an upper base and a lower base are set to connect the first column and the second column, and a third column is set on the upper base, and the third column is set between the first column and the second column, so that the magnetic core is integrated into an integral structure. Compared with the scattered magnetic columns, the one-piece magnetic core structure simplifies the structure of the magnetic core and reduces the production cost of the magnetic core structure. The magnetic core processing efficiency is high, the cost is reasonable and it is suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 A three-dimensional diagram of the magnetic core structure in the embodiment;

[0017] Figure 2 A cross-sectional view of the magnetic core structure in the embodiment;

[0018] Figure 3 3D diagram of the differential and common mode integrated inductor in the embodiment.

[0019] Reference numerals:

[0020] 1-first column; 2-second column; 3-third column; 4-upper base; 5-lower base; 6-air gap;

[0021] 10-first window; 20-second window; 30-first coil; 40-second coil. DETAILED DESCRIPTION

[0022] The following diagrams illustrate various embodiments of the present application. For clarity, many practical details will be included in the following description. However, it should be understood that these practical details are not intended to limit the present application. In other words, in some embodiments of the present application, these practical details are not essential. Furthermore, to simplify the drawings, some conventional structures and components are depicted in a simplified schematic manner.

[0023] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0024] In addition, in this application, descriptions such as "first" and "second" are only used for descriptive purposes and do not specifically refer to the order or ranking, nor are they used to limit this application. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0025] In order to further understand the application content, features and effects of this application, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0026] Example 1

[0027] See also Figure 1 and Figure 2 , Figure 1 It is a three-dimensional diagram of the core structure. Figure 2 : is a cross-sectional view of the magnetic core structure. The magnetic core structure in this example includes a first column 1, a second column 2, a third column 3, an upper base 4 and a lower base 5. The first column 1, the second column 2, the third column 3, the upper base 4 and the lower base 5 together constitute the magnetic core structure in the inductor.

[0028] Among them, the upper base 4 and the lower base 5 are arranged opposite to and parallel to each other, the first column 1 is arranged at one end of the upper base 4, one end of which is connected to the upper base 4, and the other end is connected to the lower base 5, the second column 2 is arranged at the other end of the upper base 4, one end of which is connected to the upper base 4, and the other end is connected to the lower base 5, the third column 3 is located between the first column 1 and the second column 2, that is, it is arranged in the middle of the upper base 4, one end of which is connected to the upper base 4, and an air gap 6 is formed between the other end and the lower base 5, that is, there is a gap between the third column 3 and the lower base 5, the first column 1, the third column 3 and the second column 2 are arranged on the upper base 4 in sequence, similarly, the first column 1, the third column 3 and the second column 2 are arranged on the lower base 5 in sequence; the first column 1, the second column 2, the third column 3, the upper base 4 and the lower base 5 are formed as one piece.

[0029] Specifically, the magnetic core structure is formed by one-piece die-casting, the upper bottom 4 and the lower bottom 5 are arranged relative to each other, and the upper bottom 4 and the lower bottom 5 have the same size specifications. In this example, the first column 1, the second column 2, the third column 3, the upper bottom 4 and the lower bottom 5 are all made of manganese zinc material. Optionally, the magnetic core structure can be made of nickel zinc or hard magnetic or iron silicon aluminum material. A first window 10 is formed between the first column 1 and the third column 3, and a second window 20 is formed between the second column 2 and the third column 3. The first window 10 and the second window 20 can be used for winding the first column 1 and the second column 2. The size of the air gap 6 can also be used to adjust the DC current saturation resistance of the inductor.

[0030] In specific applications, by optimizing the magnetic core structure, an upper base 4 and a lower base 5 are set to connect the first column 1 and the second column 2, and a third column 3 is set on the upper base 4, and the third column 3 is set between the first column 1 and the second column 2, so that the magnetic core is integrated into an integral structure. Compared with the scattered magnetic columns, the one-piece magnetic core structure simplifies the structure of the magnetic core and reduces the production cost of the magnetic core structure. The magnetic core processing efficiency is high, the cost is reasonable and it is suitable for large-scale production.

[0031] Furthermore, along the length direction of the third column 3 , the first column 1 and the second column 2 are symmetrical.

[0032] Specifically, the first column 1 and the second column 2 have the same specifications and dimensions, the third column 3 is shorter than the first column 1 or the second column 2, and there is a gap between the third column 3 and the lower base 5. The air gap 6 is the gap between the third column 3 and the lower base 5.

[0033] In this way, the loss of magnetic flux in the magnetic core structure can be reduced.

[0034] Furthermore, outer surfaces of the first column 1 , the second column 2 , the third column 3 , the upper base 4 and the lower base 5 are all sprayed with insulating paint.

[0035] In this way, the insulation performance of the magnetic core structure is guaranteed.

[0036] Furthermore, the cross sections of the first column 1 , the second column 2 and the third column 3 are circular or rectangular.

[0037] In this example, the cross-sections of the first cylinder 1, the second cylinder 2 and the third cylinder 3 are all circular. The cylinders with circular cross-sections can make the coil fit closely with the cylinders during winding, reducing the loss of the coil during winding. The first cylinder 1, the second cylinder 2 and the third cylinder 3 with square cross-sections can withstand greater current and magnetic force.

[0038] Example 2

[0039] Please also refer to Figure 3 , Figure 3 This is a three-dimensional diagram of a differential and common-mode integrated inductor. The differential and common-mode integrated inductor in this example includes a magnetic core structure, a first coil 30 and a second coil 40. The first coil 30 is wound on the first column 1, and the second coil 40 is wound on the second column 2. The first coil 30 and the second coil 40 have the same number of turns and are wound in opposite directions.

[0040] In this way, when the first coil 30 and the second coil 40 have the same number of turns, the magnetic flux loss is small.

[0041] Furthermore, the first coil 30 and the second coil 40 are both flat enameled wires.

[0042] In this way, the flat enameled wire occupies less space in the length direction of the first cylinder 1 or the second cylinder 2 , and more turns can be wound.

[0043] In summary, through the optimization of the magnetic core structure, the upper base and the lower base are set to connect the first column and the second column, and the third column is set on the upper base, and the third column is set between the first column and the second column, so that the magnetic core is integrated into an integral structure. Compared with the scattered magnetic columns, the one-piece magnetic core structure simplifies the structure of the magnetic core and reduces the production cost of the magnetic core structure. The magnetic core processing efficiency is high, the cost is reasonable and it is suitable for large-scale production.

[0044] The above is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.

Claims

1. A magnetic core structure, characterized in that: include: A first column (1), a second column (2), a third column (3), an upper base (4) and a lower base (5), wherein the upper base (4) and the lower base (5) are arranged opposite to and in parallel with each other, the first column (1) is located at one end of the upper base (4), one end of which is connected to the upper base (4), and the other end is connected to the lower base (5), the second column (2) is located at the other end of the upper base (4), one end of which is connected to the upper base (4), and the other end is connected to the lower base (5), the third column (3) is located between the first column (1) and the second column (2), one end of which is connected to the upper base (4), and an air gap (6) is formed between the other end of the third column (3) and the lower base (5); the first column (1), the second column (2), the third column (3), the upper base (4) and the lower base (5) are integrally formed.

2. The magnetic core structure according to claim 1, characterized in that Along the length direction of the third column (3), the first column (1) and the second column (2) are symmetrical.

3. The magnetic core structure according to claim 1, characterized in that The first column (1), the second column (2), the third column (3), the upper base (4) and the lower base (5) are all made of manganese zinc, nickel zinc, hard magnetic or iron silicon aluminum materials.

4. The magnetic core structure according to claim 1, wherein: The outer surfaces of the first column (1), the second column (2), the third column (3), the upper base (4) and the lower base (5) are all sprayed with insulating paint.

5. The magnetic core structure according to claim 1, wherein: The first column (1), the second column (2), the third column (3), the upper base (4) and the lower base (5) are integrally die-cast.

6. The magnetic core structure according to claim 1, characterized in that The cross sections of the first column (1), the second column (2) and the third column (3) are circular or rectangular.

7. A differential and common mode integrated inductor, characterized in that: The magnetic core structure comprises the magnetic core structure described in any one of claims 1 to 6, and further comprises a first coil (30) and a second coil (40), wherein the first coil (30) is wound on the first column (1), and the second coil (40) is wound on the second column (2), and the number of turns of the first coil (30) and the second coil (40) are equal.

8. The differential and common mode integrated inductor according to claim 7, characterized in that: The first coil (30) and the second coil (40) are both flat enameled wires.

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